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INTRODUCTION 471
Acknowledgments 471
THE HYLA BISTINCTA GROUP 472
Analysis of Characters 473
Key to the Species of the Hyla Bistincta Group 474
ACCOUNTS OF THE SPECIES 475
_Hyla bistincta_ Cope 475
_Hyla charadricola_ new species 478
_Hyla robertsorum_ Taylor 481
_Hyla pachyderma_ Taylor 485
_Hyla crassa_ (Brocchi) 486
RELATIONSHIPS 489
LITERATURE CITED 491